To become an mathematician, you need to have the following knowledge: 1. Basic economics knowledge, including macro economics, micro economics, economic theory, etc. 2. Knowledge of statistics: An mathematician needs to have basic knowledge of statistics in order to be able to analyze data and make predictions. 3. Mathematical knowledge: An mathematician needs to master some mathematical tools such as calculus, probability theory, mathematical statistics, etc. 4. Political and legal knowledge: An mathematician needs to understand political and legal knowledge in order to be able to formulate and implement economic policies. 5. Research methods: An mathematician needs to be familiar with various research methods such as positive research, literature review, case analysis, etc. International economics: An economics expert needs to understand the international economic structure and international relations in order to formulate international economic policies. 7. Practice of economics: An mathematician needs to understand the latest developments in the practice of economics such as finance, trade, industry, etc. An mathematician needed to have a broad range of knowledge and be able to use it to solve practical problems.